Brake-shoe.



PATENTED JAN. 9, 1906 H. L. WINSLOW.

BRAKE SHOE.

APPLICATION FILED FEB. 17, 1905 2 SHEETS-SHEET fin a mp4s PATENTED JAN. 9, 1906.

H. L. WINSLOW.

BRAKE SHOE.

APPLIOA'IION FILED IEB.17.1905.

2 SHEETSSHEET 2 HORACE L. WINSLOW, OF CHICAGO, ILLINOIS.

BRAKE-SHOE.

Specification of Letters Patent.

Patented Jan. 9, 1906.

Application filed Fe r ary 1'7, 1905. Serial No. 245,989.

To 51/7, whom it may concern:

Be it known that I, HORACE L. WINsLow, a citizen of the United States, residing at Chicago, county of Cook, State of Illinois, have invented a certain new and useful Improvement in Brake-Shoes; and I declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

My invention relates in general to brakeshoes, and more particularly to that type of brake-shoes which is reinforced by strengthening-plates of tough ductile material located at the back thereof and in which the wearing-surface is provided with hard-metal inserts.

Cast-metal brake-shoes when worn thin frequently break and become disengaged from the brake-heads, thereby not only destroying the shoes, but sometimes causing accident by falling on the track and derailing the cars.

The primary object of my invention is to provide a brake-shoe the durability of which is increased both by embedding hard-metal inserts in its wearing-surface and by strengthening its back with a tough duotile-metal plate, the inserts being secured to the back plate prior to casting the body of the shoe thereto, whereby the back plate securely retains the inserts in the shoe and in turn is firmly united to the body of the shoe through its engagement with the inserts.

A further object of my invention is to provide a brake-shoe which will be simple in construction, inexpensive in manufacture, strong, durable, eflicient in use, and which will afl'ord an effective braking-surface until entirely worn away.

My invention will be more fully described hereinafter with reference to the accompanying drawings, in which the same is illustrated as embodied in several convenient and practical forms, and in which Figure 1 is a longitudinal section on line 1 1, Figs. 3 and 5; Fig. 2,,a longitudinal section on line 2 2, Figs. 3 and 5; Fig. 3, a plan view of the back of the brake-shoe; Fig. 4., a sectional view on line 4 4, Figs. 1 and 5; Fig. 5, a sectional view on line 5 5, Fig. 4; Fig. 6, a central longitudinal section of another form of brake shoe embodying said invention;

Fig. 7, a plan view of a portion of the wearing-surface; Fig. 8, a sectional view on line 8 8, Fig. 6; Fig. 9, a View similar to Fig. 6, showing a modification; Fig. 10, a plan view of a portion of the back of a shoe, showing a modified form of back plate; and Fig. 11, a sectional View on line 11 11, Fig. 10.

Similar reference characters are used to designate similar parts in the several figures of the drawings.

In Figs. 1 to 5 I have illustrated my invention as applied to a locomotive brake-shoe. A designates the body of the shoe made of cast metal and provided with the usual fastening-hook B and lug b for securing the shoe to a brake-head. C indicates the flange of this shoe which overlies the flange of the locomotive-wheel. D indicates a strengthening-plate located at the back of the shoe and provided with inwardly-extending lugs em edded in the body of the shoe. The plate D is provided with a hook 6, around which the cast-metal hook D extends for strengthening the latter. The plate D may conveniently be formed in two longitudinal sections F and G, the longitudinal edges of which are bent inwardly to form staggered lugs f and g. Alternate pairs of lugs f on the section F of the back plate are bent toward each other, thereby forming dovetailed channels, in which are received dovetailed projections h of inserts H. The inserts are made of hard metal and render the wearing-surface of the shoe more durable. Any desired number of inserts may be secured to the sections of the back plate. I/Vhen, however, the shoe is provided with a longitudinal groove (1, as shown in Fig. 5, inserts are not secured to the section of the back plate above such groove. The portion of the shoe 0 which overlies and enga es the flange of the wheel is also preferabIy-provided with a strengthening-plate K, having inturned flanges 7c at its longitudinal edges. Such flanges form a dovetailed channel, within which is received wedge-shaped lugs Z at the upper ends of hard-metal inserts L. The inserts are engaged with the strengthening-plate prior to casting the body of the shoe. The lugs may be either mechanically engaged with the projections on the strengthening plate or they may be cast thereon prior to casting the body of the shoe around the inserts and around the projections on the strengthening-plate.

In Figs. 6 to 11, inclusive, I have illustrated my invention as embodied in a carbrake shoe. In Fig. 6 the strengthening back plate is formed in two sections D and D located end to end and having their adjacent ends (1 and d bent upwardly at either side of the cast-metal key-lug B. .The longitudinal side edges of each section of the back plate are bent inwardly, as shown at d in Fig. 8, to form adovetailed channel to receive the dovetailed upper portion h of a series of hard-metal inserts H. The outwardly-bent ends d and (Z of the two parts of the back plate may serve as a key-lug without forming the key-lug integrally with the cast metal of the shoe. This modification of my invention is shown in Fig. 9. In order that the lugs or ears d (1 may have sufiicient strength, the outer edges thereof maybe bent, so as to form strengthening-flanges at the outer edges of the keyholes therethrough. Each part of the strengthening back plate may be formed with parallel sections, as shown in Fig. 10. In this figure G and F indicate the sections of each part of the back plate, each of such sections having pro jections extending from their longitudinal edges into the body of the shoe and between which are formed channels to receive the lugs k of the hard-metal inserts H In Fig. 11 I have shown the projections g of the section G as forming one dovetailed channel and the projections f of the section F as forming a second dovetailed c'nannel, so that by providing two lugs on each insert the latter may be rigidly secured to the back plate of the shoe. The inserts for increasing the wearing.capacity of the braking-surface of the shoe may be of any desired shape and of any desired metal. They may conveniently be formed wedge-shaped, as shown in Figs. 7 and 11.

From the foregoing description it will b observed that I have invented an improved brake-shoe the wearing-surface of which is rendered more durable by hard-metal inserts and the longevity of which is increased by the strengthening back plates, and have at the same time united the inserts to the back plate, thereby securely retaining the inserts in the shoe and also tightly fastening the strengthening back to the body of the shoe.

While I have described more or less precisely the details of construction, I do not wish to be understood as limiting myself thereto, as I contemplate changes in form, the proportion of parts, and the substitution of equivalents, as circumstances may suggest or render expedient, without departing from the spirit of my invention.

Having now fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a brake-shoe the combination with a cast-metal body, of a strengthening-plate losoaess cated at the back of said body, and a plurality of staggered projections extending from the longitudinal edges of said plate and embedded in said body.

2. In a brake-shoe the combination with a cast metal body, of a strengthening plate comprising parallel sections located at the back of said body, and projections extending from the longitudinal edges of the sections of said plate and embedded in said body.

3. In a brake-shoe the combination with a cast-metal body, of a strengthening-plate located at the back of said body, projections extending from said plate and embedded in said body, inserts in the wearing-surface of the shoe, and means for securing said inserts to said back plate.

4. I11 a brake-shoe the combination with a cast-metal body,- of a strengthening-plate located at the back of said body, projections extending from the longitudinal edges of said plate and embedded in said body, and inserts in the wearing-surface of the shoe secured to said projections.

5. In a brake-shoe the combination with a cast-metal body, of a strengthening-plate located at the back of said body, projections extending from the longitudinal edges of said plate, and embedded in said body, said projections forming a dovetailed channel, inserts in the wearing-surface of the shoe, andv dovetailed lugs on said inserts engaged with the channels between said projections.

6. In a brake-shoe the combination with a cast-metal body, of a strengthening-plate comprising parallel sections located at the back of said body, projections extending from the longitudinal edges of the parallel sections of said plate and embedded in said body, the projections on each section forming a dovetailed channel, inserts in the wearingsurface of the shoe, and dovetailed lugs on said inserts received within said channels.

7. In a brake-shoe the combination with a cast-metal body, of a strengthening back plate formed in two parts arranged end to end, outwardly-projecting ears formed integrally with the inner ends of the two parts of said plate, said ears having holes therethrough for the passage of a fasteningkey.

8. In a brake-shoe the combination with a cast-metal body, of a strengthening back plate formed in two parts arranged end to end, outwardly-projecting ears formed inte grally with the inner ends of the two parts of said plate, said ears havingholes therethrough for the passage of a fastening-ke and strengthening-flanges formed integral y with the outer ends of said ears.

9. In a brake-shoe the combination with a cast-metal body and key-lug formed integrally therewith, of a strengthening back plate formed in two parts located at each side of said lug, outwardly-projecting ears formed integrally with the inner ends of the two parts of said plate, said ears having holes therethrough registering with the keyhole in said lug.

10. In a' brake-shoe the combination with a cast-metal body, of a strengthening back plate formed in two parts arranged end to end, outwardly-projecting ears formed integrally with the inner ends of the two parts of said plate, said ears having holes therethrough for the passage of a fastening-key, each part of said plate comprising parallel sections and projections extending from the longitudinal edges of the parallel sections of said plate and embedded in said body.

1 1. In a brake-shoe the combination with a cast-metal body, of a strengthening back plate formed in two parts located end to end, inserts in the wearing-surface of the shoe and means for securing said inserts to said back plate.

12. In a brake-shoe the combination with a cast metal body, of a strengthening back plate formed in two parts located end to end, outwardly-projecting ears formed integrally with the inner ends of the two parts of said plate, said ears having holes therethrough for the passage of a fastening-key, each part of said plate comprising parallel sections, projections extending from the longitudinal edges of each section of the two parts of said plate and embedded in said body, inserts in the wearing-surface of the shoe, and means for securing said inserts to said projections.

13. In a brake-shoe the combination with a cast-metal body, of a strengthening-plate located at the back of said body, and inserts secured to said plate and forming portions of the wearing-surface of the shoe.

14. A brake-shoe comprising a back plate, a plurality of inserts carried by said plate, and a body cast around and locked to said inserts.

15'. A brake-shoe comprising a back plate, depending lips on the back plate, inserts having a dovetailed connection with said lips, and a body having a dovetailed connection with said inserts.

16. A brake-shoe comprising a back plate, a body, an attaching-lug integral With the body and made in the shape of a hook, and a hook on the plate forming an inside lining for said lug.

17. A brake-shoe comprising a back plate, a body cast on the back plate, an attachinghook on said back plate, and a lug cast integrally with said body engaging the outer sur- 7 face ofsaid hook to strengthen the same.

In testimony whereof I sign this specification in the presence of two witnesses.

- HORACE L. l/VINSLOW. Witnesses:

GEO. L. WVILKINsoN, Q. A. MULLEN. 

